Simultaneous ion sputter polishing and deposition

Results of experiments to study ion beam sputter polishing in conjunction with simultaneous deposition as a mean of polishing copper surfaces are presented. Two types of simultaneous ion sputter polishing and deposition were used in these experiments. The first type utilized sputter polishing simultaneous with vapor deposition, and the second type utilized sputter polishing simultaneous with sputter deposition. The etch and deposition rates of both techniques were studied, as well as the surface morphology and surface roughness

Coaxial carbon plasma gun deposition of amorphous carbon films

A unique plasma gun employing coaxial carbon electrodes was used in an attempt to deposit thin films of amorphous diamond-like carbon. A number of different structural, compositional, and electrical characterization techniques were used to characterize these films. These included scanning electron microscopy, scanning transmission electron microscopy, X ray diffraction and absorption, spectrographic analysis, energy dispersive spectroscopy, and selected area electron diffraction. Optical absorption and electrical resistivity measurements were also performed. The films were determined to be primarily amorphous, with poor adhesion to fused silica substrates. Many inclusions of particulates were found to be present as well. Analysis of these particulates revealed the presence of trace impurities, such as Fe and Cu, which were also found in the graphite electrode material. The electrodes were the source of these impurities. No evidence of diamond-like crystallite structure was found in any of the film samples. Details of the apparatus, experimental procedure, and film characteristics are presented

Sputtered coatings for protection of spacecraft polymers

Kapton polyimide oxidizes at significant rates (4.3x10(-24) gram/incident oxygen atom) when exposed in low Earth orbit to the ram atomic oxygen flux. Ion beam sputter deposited thin films of Al2O3 and SiO2 as well as a codeposited mixture of predominantly SiO2 with a small amount of polytetrafluoroethylene were evaluated and found to be effective in protecting Kapton from oxidation in both laboratory plasma ashing tests as well as in space on board shuttle flight STS-8. A protective film of or = 96 percent SiO2 and or = 4 percent polytetrafluoroethylene was found to be very flexible compared to the pure metal oxide coatings and resulted in mass loss rates that were 0.2 percent of that of the unprotected Kapton. The optical properties of Kapton for wavelengths investigated between 0.33 and 2.2 microns were not significantly altered by the presence of the coatings or changed by exposure of the coated Kapton to the low Earth orbital ram environment

Ion beam sputter-deposited thin film coatings for protection of spacecraft polymers in low Earth orbit

Ion beam sputter-deposited thin films of Al2O3, SiO2, and a codeposited mixture of predominantly SiO2 with small amounts of a fluoropolymer were evaluated both in laboratory plasma ashing tests and in space on board shuttle flight STS-8 for effectiveness in preventing oxidation of polyimide Kapton. Measurements of mass loss and optical performance of coated and uncoated polyimide samples exposed to the low Earth orbital environment are presented. Optical techniques were used to measure loss rates of protective films exposed to atomic oxygen. Results of the analysis of the space flight exposed samples indicate that thin film metal oxide coatings are very effective in protecting the polyimide. Metal oxide coatings with a small amount of fluoropolymer codeposited have the additional benefit of great flexibility

Cosmological versus Intrinsic: The Correlation between Intensity and the Peak of the nu F_nu Spectrum of Gamma Ray Bursts

We present results of correlation studies, examining the association between the peak of the nu F_nu spectrum of gamma ray bursts, E_p, with the burst's energy fluence and photon peak flux. We discuss methods to account for data truncation in E_p and fluence or flux when performing the correlation analyses. However, because bursts near the detector threshold are not usually able to provide reliable spectral parameters, we focus on results for the brightest bursts in which we can better understand the selection effects relevant to E_p and burst strength. We find that there is a strong correlation between total fluence and E_p. We discuss these results in terms of both cosmological and intrinsic effects. In particular, we show that for realistic distributions of the burst parameters, cosmological expansion alone cannot account for the correlation between E_p and total fluence; the observed correlation is likely a result of an intrinsic relation between the burst rest-frame peak energy and the total radiated energy. We investigate this latter scenario in the context of synchrotron radiation from external and internal shock models of GRBs. We find that the internal shock model is consistent with our interpretation of the correlation, while the external shock model cannot easily explain this intrinsic relation between peak energy and burst radiated energy.Comment: 23 pages, including 8 postscript figures. Submitted to Ap

Animal Assisted Therapy in a Special Needs Dental Practice: An Interprofessional Model for Anxiety Reduction

Purpose: Individuals with intellectual and developmental disabilities (IDD) suffer from poor oral hygiene and periodontal disease that may predispose them to systemic diseases. In order to receive dental care, the assistance of a certified registered nurse anesthetist (CRNA) is often needed. The role of the CRNA is to provide sedation to reduce the high level of anxiety demonstrated by many individuals with intellectual disabilities in the dental suite. However, this can become a challenge with patients that are anxious when they arrive. The purpose of this paper is to describe an interprofessional dental team that added a certified therapy dog and handler to reduce anxiety of individuals with IDD when they arrive in the dental suite. Methods: A convenience sample of 30 individuals with intellectual disability seen for dental care in an outpatient setting met with a therapy dog prior to receiving preventative dental care. Comparisons were made between observed anxiety levels and behaviors measured by the ADAMS (anxiety scale) and a researcher-developed behavior tool prior to and after the interaction with the therapy dog. Results:This program suggested that the addition of the therapy dog to the interprofessional team prior to sedation decreased anxiety levels and improved the behavioral outcomes of the individual with intellectual disabilities. Conclusions:The incorporation of a certified therapy dog and handler as part of an interprofessional healthcare team in the dental suite may pay great dividends in improving the compliance and comfort of the individual with intellectual and developmental disabilities during dental care visits

Animal Assisted Therapy in a Special Needs Dental Practice: An Interprofessional Model for Anxiety Reduction

Purpose: Individuals with intellectual and developmental disabilities (IDD) suffer from poor oral hygiene and periodontal disease that may predispose them to systemic diseases. In order to receive dental care, the assistance of a certified registered nurse anesthetist (CRNA) is often needed. The role of the CRNA is to provide sedation to reduce the high level of anxiety demonstrated by many individuals with intellectual disabilities in the dental suite. However, this can become a challenge with patients that are anxious when they arrive. The purpose of this paper is to describe an interprofessional dental team that added a certified therapy dog and handler to reduce anxiety of individuals with IDD when they arrive in the dental suite.Methods: A convenience sample of 30 individuals with intellectual disability seen for dental care in an outpatient setting met with a therapy dog prior to receiving preventative dental care. Comparisons were made between observed anxiety levels and behaviors measured by the ADAMS (anxiety scale) and a researcher-developed behavior tool prior to and after the interaction with the therapy dog.Results: This program suggested that the addition of the therapy dog to the interprofessional team prior to sedation decreased anxiety levels and improved the behavioral outcomes of the individual with intellectual disabilities.Conclusions: The incorporation of a certified therapy dog and handler as part of an interprofessional healthcare team in the dental suite may pay great dividends in improving the compliance and comfort of the individual with intellectual and developmental disabilities during dental care visits

Disposal of Household Wastewater in Soils of High Stone Content (1981-1983)

Four experimental filter fields were constructed with built-in monitoring equipment in Nixa soils. These soils contain many chert fragments and a fragipan about 60 cm below the soil surface. The fragipan restricts downward movement of water and is the designlimitingfeature. The four filter fields were: 1. A standard filter field, 76 cm deep. The bottom of the trench was in the fragipan. 2. A modified standard filter field, 30 cm deep. The bottom of the trench was above the fragipan. 3. A modified pressure filter field, 40 cm deep. The bottom of the trench was above the fragipan. In addition, a pressure-distribution system was used to insure uniform distribution of effluent in the trench. Inadvertently, this field was installed in a different soil, and the results cannot be compared directly with the other three. 4. Another modified pressure filter field with the bottom of the trench only 6 cm below the soil surface. Observation of these systems confirms that placing filter fields higher in the soil above the hydraulically limiting horizon results in improved hydraulic performance. The presence of the fragipan amplified the adverse effects attributable to climatic stress. The seepage beds which are higher in the soil profile are able to handle the effluent load and climate load with less danger of surfacing

Do Tax Incentives Increase 401(K) Retirement Saving? Evidence from the Adoption of Catch-Up Contributions

Retirement Research Consortium. The opinions and conclusions expressed are solely those of the authors and do not represent the opinions or policy of SSA, any agency of the federal government, or Boston College. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of the contents of this report. Reference herein to any specific commercial product, process or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply endorsement, recommendation or favoring by the United States Government or any agency thereof. The authors are indebted to the indispensable data analysis of Qi Guan, and would also like to thank Robin Jensen for excellent research assistance. The authors are grateful to Kelly Trageser, Gary Benedetto, and Martha Stinson for helping us access the SIPP synthetic data and re-running our code on the actual data

Lawyers Should Keep Their Eyes on Cuba Sanctions Cases

A dramatic change in the executive branch position on Cuban sanctions recently led to a wave of litigation in the federal courts and could have broad implications for entities that conduct business in or with Cuba. In April, Secretary of State Mike Pompeo announced that Title III of the Helms-Burton Act would no longer be suspended, thereby allowing U.S. nationals to file lawsuits against any individual or entity that “traffics” in property expropriated by the Cuban government